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FFmpeg/libavcodec/ffv1dec.c

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  1. /*

  2.  * FFV1 decoder

  3.  *

  4.  * Copyright (c) 2003-2012 Michael Niedermayer <michaelni@gmx.at>

  5.  *

  6.  * This file is part of Libav.

  7.  *

  8.  * Libav is free software; you can redistribute it and/or

  9.  * modify it under the terms of the GNU Lesser General Public

  10.  * License as published by the Free Software Foundation; either

  11.  * version 2.1 of the License, or (at your option) any later version.

  12.  *

  13.  * Libav is distributed in the hope that it will be useful,

  14.  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  15.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

  16.  * Lesser General Public License for more details.

  17.  *

  18.  * You should have received a copy of the GNU Lesser General Public

  19.  * License along with Libav; if not, write to the Free Software

  20.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  21.  */

  22. 

  23. /**

  24.  * @file

  25.  * FF Video Codec 1 (a lossless codec) decoder

  26.  */

  27. 

  28. #include "libavutil/avassert.h"

  29. #include "libavutil/pixdesc.h"

  30. #include "libavutil/crc.h"

  31. #include "libavutil/opt.h"

  32. #include "libavutil/imgutils.h"

  33. #include "libavutil/timer.h"

  34. 

  35. #include "avcodec.h"

  36. #include "bitstream.h"

  37. #include "golomb.h"

  38. #include "internal.h"

  39. #include "put_bits.h"

  40. #include "rangecoder.h"

  41. #include "mathops.h"

  42. #include "ffv1.h"

  43. 

  44. static inline av_flatten int get_symbol_inline(RangeCoder *c, uint8_t *state,

  45.                                                int is_signed)

  46. {

  47.     if (get_rac(c, state + 0))

  48.         return 0;

  49.     else {

  50.         int i, e, a;

  51.         e = 0;

  52.         while (get_rac(c, state + 1 + FFMIN(e, 9))) // 1..10

  53.             e++;

  54. 

  55.         a = 1;

  56.         for (i = e - 1; i >= 0; i--)

  57.             a += a + get_rac(c, state + 22 + FFMIN(i, 9));  // 22..31

  58. 

  59.         e = -(is_signed && get_rac(c, state + 11 + FFMIN(e, 10))); // 11..21

  60.         return (a ^ e) - e;

  61.     }

  62. }

  63. 

  64. static av_noinline int get_symbol(RangeCoder *c, uint8_t *state, int is_signed)

  65. {

  66.     return get_symbol_inline(c, state, is_signed);

  67. }

  68. 

  69. static inline int get_vlc_symbol(BitstreamContext *bc, VlcState *const state,

  70.                                  int bits)

  71. {

  72.     int k, i, v, ret;

  73. 

  74.     i = state->count;

  75.     k = 0;

  76.     while (i < state->error_sum) { // FIXME: optimize

  77.         k++;

  78.         i += i;

  79.     }

  80. 

  81.     assert(k <= 8);

  82. 

  83.     v = get_sr_golomb(bc, k, 12, bits);

  84.     ff_dlog(NULL, "v:%d bias:%d error:%d drift:%d count:%d k:%d",

  85.             v, state->bias, state->error_sum, state->drift, state->count, k);

  86. 

  87.     v ^= ((2 * state->drift + state->count) >> 31);

  88. 

  89.     ret = fold(v + state->bias, bits);

  90. 

  91.     update_vlc_state(state, v);

  92. 

  93.     return ret;

  94. }

  95. 

  96. static av_always_inline void decode_line(FFV1Context *s, int w,

  97.                                          int16_t *sample[2],

  98.                                          int plane_index, int bits)

  99. {

  100.     PlaneContext *const p = &s->plane[plane_index];

  101.     RangeCoder *const c   = &s->c;

  102.     int x;

  103.     int run_count = 0;

  104.     int run_mode  = 0;

  105.     int run_index = s->run_index;

  106. 

  107.     for (x = 0; x < w; x++) {

  108.         int diff, context, sign;

  109. 

  110.         context = get_context(p, sample[1] + x, sample[0] + x, sample[1] + x);

  111.         if (context < 0) {

  112.             context = -context;

  113.             sign    = 1;

  114.         } else

  115.             sign = 0;

  116. 

  117.         av_assert2(context < p->context_count);

  118. 

  119.         if (s->ac != AC_GOLOMB_RICE) {

  120.             diff = get_symbol_inline(c, p->state[context], 1);

  121.         } else {

  122.             if (context == 0 && run_mode == 0)

  123.                 run_mode = 1;

  124. 

  125.             if (run_mode) {

  126.                 if (run_count == 0 && run_mode == 1) {

  127.                     if (bitstream_read_bit(&s->bc)) {

  128.                         run_count = 1 << ff_log2_run[run_index];

  129.                         if (x + run_count <= w)

  130.                             run_index++;

  131.                     } else {

  132.                         if (ff_log2_run[run_index])

  133.                             run_count = bitstream_read(&s->bc, ff_log2_run[run_index]);

  134.                         else

  135.                             run_count = 0;

  136.                         if (run_index)

  137.                             run_index--;

  138.                         run_mode = 2;

  139.                     }

  140.                 }

  141.                 run_count--;

  142.                 if (run_count < 0) {

  143.                     run_mode  = 0;

  144.                     run_count = 0;

  145.                     diff      = get_vlc_symbol(&s->bc, &p->vlc_state[context],

  146.                                                bits);

  147.                     if (diff >= 0)

  148.                         diff++;

  149.                 } else

  150.                     diff = 0;

  151.             } else

  152.                 diff = get_vlc_symbol(&s->bc, &p->vlc_state[context], bits);

  153. 

  154.             ff_dlog(s->avctx, "count:%d index:%d, mode:%d, x:%d pos:%d\n",

  155.                     run_count, run_index, run_mode, x, bitstream_tell(&s->bc));

  156.         }

  157. 

  158.         if (sign)

  159.             diff = -diff;

  160. 

  161.         sample[1][x] = (predict(sample[1] + x, sample[0] + x) + diff) &

  162.                        ((1 << bits) - 1);

  163.     }

  164.     s->run_index = run_index;

  165. }

  166. 

  167. static void decode_plane(FFV1Context *s, uint8_t *src,

  168.                          int w, int h, int stride, int plane_index)

  169. {

  170.     int x, y;

  171.     int16_t *sample[2];

  172.     sample[0] = s->sample_buffer + 3;

  173.     sample[1] = s->sample_buffer + w + 6 + 3;

  174. 

  175.     s->run_index = 0;

  176. 

  177.     memset(s->sample_buffer, 0, 2 * (w + 6) * sizeof(*s->sample_buffer));

  178. 

  179.     for (y = 0; y < h; y++) {

  180.         int16_t *temp = sample[0]; // FIXME: try a normal buffer

  181. 

  182.         sample[0] = sample[1];

  183.         sample[1] = temp;

  184. 

  185.         sample[1][-1] = sample[0][0];

  186.         sample[0][w]  = sample[0][w - 1];

  187. 

  188. // { START_TIMER

  189.         if (s->avctx->bits_per_raw_sample <= 8) {

  190.             decode_line(s, w, sample, plane_index, 8);

  191.             for (x = 0; x < w; x++)

  192.                 src[x + stride * y] = sample[1][x];

  193.         } else {

  194.             decode_line(s, w, sample, plane_index,

  195.                         s->avctx->bits_per_raw_sample);

  196.             if (s->packed_at_lsb) {

  197.                 for (x = 0; x < w; x++)

  198.                     ((uint16_t *)(src + stride * y))[x] = sample[1][x];

  199.             } else {

  200.                 for (x = 0; x < w; x++)

  201.                     ((uint16_t *)(src + stride * y))[x] = sample[1][x] << (16 - s->avctx->bits_per_raw_sample);

  202.             }

  203.         }

  204. // STOP_TIMER("decode-line") }

  205.     }

  206. }

  207. 

  208. static void decode_rgb_frame(FFV1Context *s, uint8_t *src[3], int w, int h,

  209.                              int stride[3])

  210. {

  211.     int x, y, p;

  212.     int16_t *sample[4][2];

  213.     int lbd  = s->avctx->bits_per_raw_sample <= 8;

  214.     int bits = s->avctx->bits_per_raw_sample > 0

  215.                ? s->avctx->bits_per_raw_sample

  216.                : 8;

  217.     int offset = 1 << bits;

  218. 

  219.     for (x = 0; x < 4; x++) {

  220.         sample[x][0] = s->sample_buffer +  x * 2      * (w + 6) + 3;

  221.         sample[x][1] = s->sample_buffer + (x * 2 + 1) * (w + 6) + 3;

  222.     }

  223. 

  224.     s->run_index = 0;

  225. 

  226.     memset(s->sample_buffer, 0, 8 * (w + 6) * sizeof(*s->sample_buffer));

  227. 

  228.     for (y = 0; y < h; y++) {

  229.         for (p = 0; p < 3 + s->transparency; p++) {

  230.             int16_t *temp = sample[p][0]; //FIXME try a normal buffer

  231. 

  232.             sample[p][0] = sample[p][1];

  233.             sample[p][1] = temp;

  234. 

  235.             sample[p][1][-1] = sample[p][0][0];

  236.             sample[p][0][w]  = sample[p][0][w - 1];

  237.             if (lbd)

  238.                 decode_line(s, w, sample[p], (p + 1) / 2, 9);

  239.             else

  240.                 decode_line(s, w, sample[p], (p + 1) / 2, bits + 1);

  241.         }

  242.         for (x = 0; x < w; x++) {

  243.             int g = sample[0][1][x];

  244.             int b = sample[1][1][x];

  245.             int r = sample[2][1][x];

  246.             int a = sample[3][1][x];

  247. 

  248.             b -= offset;

  249.             r -= offset;

  250.             g -= (b + r) >> 2;

  251.             b += g;

  252.             r += g;

  253. 

  254.             if (lbd)

  255.                 *((uint32_t *)(src[0] + x * 4 + stride[0] * y)) = b +

  256.                     (g << 8) + (r << 16) + (a << 24);

  257.             else {

  258.                 *((uint16_t *)(src[0] + x * 2 + stride[0] * y)) = b;

  259.                 *((uint16_t *)(src[1] + x * 2 + stride[1] * y)) = g;

  260.                 *((uint16_t *)(src[2] + x * 2 + stride[2] * y)) = r;

  261.             }

  262.         }

  263.     }

  264. }

  265. 

  266. static int decode_slice_header(FFV1Context *f, FFV1Context *fs)

  267. {

  268.     RangeCoder *c = &fs->c;

  269.     uint8_t state[CONTEXT_SIZE];

  270.     unsigned ps, i, context_count;

  271.     memset(state, 128, sizeof(state));

  272. 

  273.     if (fs->ac == AC_RANGE_CUSTOM_TAB) {

  274.         for (i = 1; i < 256; i++) {

  275.             fs->c.one_state[i]        = f->state_transition[i];

  276.             fs->c.zero_state[256 - i] = 256 - fs->c.one_state[i];

  277.         }

  278.     }

  279. 

  280.     fs->slice_x      = get_symbol(c, state, 0) * f->width;

  281.     fs->slice_y      = get_symbol(c, state, 0) * f->height;

  282.     fs->slice_width  = (get_symbol(c, state, 0) + 1) * f->width + fs->slice_x;

  283.     fs->slice_height = (get_symbol(c, state, 0) + 1) * f->height + fs->slice_y;

  284. 

  285.     fs->slice_x     /= f->num_h_slices;

  286.     fs->slice_y     /= f->num_v_slices;

  287.     fs->slice_width  = fs->slice_width / f->num_h_slices - fs->slice_x;

  288.     fs->slice_height = fs->slice_height / f->num_v_slices - fs->slice_y;

  289.     if ((unsigned)fs->slice_width  > f->width ||

  290.         (unsigned)fs->slice_height > f->height)

  291.         return AVERROR_INVALIDDATA;

  292.     if ((unsigned)fs->slice_x + (uint64_t)fs->slice_width  > f->width ||

  293.         (unsigned)fs->slice_y + (uint64_t)fs->slice_height > f->height)

  294.         return AVERROR_INVALIDDATA;

  295. 

  296.     for (i = 0; i < f->plane_count; i++) {

  297.         PlaneContext *const p = &fs->plane[i];

  298.         int idx               = get_symbol(c, state, 0);

  299.         if (idx > (unsigned)f->quant_table_count) {

  300.             av_log(f->avctx, AV_LOG_ERROR, "quant_table_index out of range\n");

  301.             return AVERROR_INVALIDDATA;

  302.         }

  303.         p->quant_table_index = idx;

  304.         memcpy(p->quant_table, f->quant_tables[idx], sizeof(p->quant_table));

  305.         context_count = f->context_count[idx];

  306. 

  307.         if (p->context_count < context_count) {

  308.             av_freep(&p->state);

  309.             av_freep(&p->vlc_state);

  310.         }

  311.         p->context_count = context_count;

  312.     }

  313. 

  314.     ps = get_symbol(c, state, 0);

  315.     if (ps == 1) {

  316.         f->cur->interlaced_frame = 1;

  317.         f->cur->top_field_first  = 1;

  318.     } else if (ps == 2) {

  319.         f->cur->interlaced_frame = 1;

  320.         f->cur->top_field_first  = 0;

  321.     } else if (ps == 3) {

  322.         f->cur->interlaced_frame = 0;

  323.     }

  324.     f->cur->sample_aspect_ratio.num = get_symbol(c, state, 0);

  325.     f->cur->sample_aspect_ratio.den = get_symbol(c, state, 0);

  326. 

  327.     if (av_image_check_sar(f->width, f->height,

  328.                            f->cur->sample_aspect_ratio) < 0) {

  329.         av_log(f->avctx, AV_LOG_WARNING, "ignoring invalid SAR: %u/%u\n",

  330.                f->cur->sample_aspect_ratio.num,

  331.                f->cur->sample_aspect_ratio.den);

  332.         f->cur->sample_aspect_ratio = (AVRational){ 0, 1 };

  333.     }

  334. 

  335.     return 0;

  336. }

  337. 

  338. static int decode_slice(AVCodecContext *c, void *arg)

  339. {

  340.     FFV1Context *fs = *(void **)arg;

  341.     FFV1Context *f  = fs->avctx->priv_data;

  342.     int width, height, x, y, ret;

  343.     const int ps = (av_pix_fmt_desc_get(c->pix_fmt)->flags & AV_PIX_FMT_FLAG_PLANAR)

  344.                    ? (c->bits_per_raw_sample > 8) + 1

  345.                    : 4;

  346.     AVFrame *const p = f->cur;

  347. 

  348.     if (f->version > 2) {

  349.         if (decode_slice_header(f, fs) < 0) {

  350.             fs->slice_damaged = 1;

  351.             return AVERROR_INVALIDDATA;

  352.         }

  353.     }

  354.     if ((ret = ffv1_init_slice_state(f, fs)) < 0)

  355.         return ret;

  356.     if (f->cur->key_frame)

  357.         ffv1_clear_slice_state(f, fs);

  358.     width  = fs->slice_width;

  359.     height = fs->slice_height;

  360.     x      = fs->slice_x;

  361.     y      = fs->slice_y;

  362. 

  363.     if (fs->ac == AC_GOLOMB_RICE) {

  364.         if (f->version == 3 && f->minor_version > 1 || f->version > 3)

  365.             get_rac(&fs->c, (uint8_t[]) { 129 });

  366.         fs->ac_byte_count = f->version > 2 || (!x && !y) ? fs->c.bytestream - fs->c.bytestream_start - 1 : 0;

  367.         bitstream_init8(&fs->bc, fs->c.bytestream_start + fs->ac_byte_count,

  368.                         (fs->c.bytestream_end - fs->c.bytestream_start -

  369.                          fs->ac_byte_count));

  370.     }

  371. 

  372.     av_assert1(width && height);

  373.     if (f->colorspace == 0) {

  374.         const int chroma_width  = AV_CEIL_RSHIFT(width,  f->chroma_h_shift);

  375.         const int chroma_height = AV_CEIL_RSHIFT(height, f->chroma_v_shift);

  376.         const int cx            = x >> f->chroma_h_shift;

  377.         const int cy            = y >> f->chroma_v_shift;

  378.         decode_plane(fs, p->data[0] + ps * x + y * p->linesize[0], width,

  379.                      height, p->linesize[0],

  380.                      0);

  381. 

  382.         if (f->chroma_planes) {

  383.             decode_plane(fs, p->data[1] + ps * cx + cy * p->linesize[1],

  384.                          chroma_width, chroma_height, p->linesize[1],

  385.                          1);

  386.             decode_plane(fs, p->data[2] + ps * cx + cy * p->linesize[2],

  387.                          chroma_width, chroma_height, p->linesize[2],

  388.                          1);

  389.         }

  390.         if (fs->transparency)

  391.             decode_plane(fs, p->data[3] + ps * x + y * p->linesize[3], width,

  392.                          height, p->linesize[3],

  393.                          2);

  394.     } else {

  395.         uint8_t *planes[3] = { p->data[0] + ps * x + y * p->linesize[0],

  396.                                p->data[1] + ps * x + y * p->linesize[1],

  397.                                p->data[2] + ps * x + y * p->linesize[2] };

  398.         decode_rgb_frame(fs, planes, width, height, p->linesize);

  399.     }

  400.     if (fs->ac != AC_GOLOMB_RICE && f->version > 2) {

  401.         int v;

  402.         get_rac(&fs->c, (uint8_t[]) { 129 });

  403.         v = fs->c.bytestream_end - fs->c.bytestream - 2 - 5 * f->ec;

  404.         if (v) {

  405.             av_log(f->avctx, AV_LOG_ERROR, "bytestream end mismatching by %d\n",

  406.                    v);

  407.             fs->slice_damaged = 1;

  408.         }

  409.     }

  410. 

  411.     emms_c();

  412. 

  413.     return 0;

  414. }

  415. 

  416. static int read_quant_table(RangeCoder *c, int16_t *quant_table, int scale)

  417. {

  418.     int v;

  419.     int i = 0;

  420.     uint8_t state[CONTEXT_SIZE];

  421. 

  422.     memset(state, 128, sizeof(state));

  423. 

  424.     for (v = 0; i < 128; v++) {

  425.         unsigned len = get_symbol(c, state, 0) + 1;

  426. 

  427.         if (len > 128 - i)

  428.             return -1;

  429. 

  430.         while (len--) {

  431.             quant_table[i] = scale * v;

  432.             i++;

  433.         }

  434.     }

  435. 

  436.     for (i = 1; i < 128; i++)

  437.         quant_table[256 - i] = -quant_table[i];

  438.     quant_table[128] = -quant_table[127];

  439. 

  440.     return 2 * v - 1;

  441. }

  442. 

  443. static int read_quant_tables(RangeCoder *c,

  444.                              int16_t quant_table[MAX_CONTEXT_INPUTS][256])

  445. {

  446.     int i;

  447.     int context_count = 1;

  448. 

  449.     for (i = 0; i < 5; i++) {

  450.         context_count *= read_quant_table(c, quant_table[i], context_count);

  451.         if (context_count > 32768U) {

  452.             return -1;

  453.         }

  454.     }

  455.     return (context_count + 1) / 2;

  456. }

  457. 

  458. static int read_extra_header(FFV1Context *f)

  459. {

  460.     RangeCoder *const c = &f->c;

  461.     uint8_t state[CONTEXT_SIZE];

  462.     int i, j, k, ret;

  463.     uint8_t state2[32][CONTEXT_SIZE];

  464. 

  465.     memset(state2, 128, sizeof(state2));

  466.     memset(state, 128, sizeof(state));

  467. 

  468.     ff_init_range_decoder(c, f->avctx->extradata, f->avctx->extradata_size);

  469.     ff_build_rac_states(c, 0.05 * (1LL << 32), 256 - 8);

  470. 

  471.     f->version = get_symbol(c, state, 0);

  472.     if (f->version > 2) {

  473.         c->bytestream_end -= 4;

  474.         f->minor_version   = get_symbol(c, state, 0);

  475.     }

  476.     f->ac = get_symbol(c, state, 0);

  477. 

  478.     if (f->ac == AC_RANGE_CUSTOM_TAB) {

  479.         for (i = 1; i < 256; i++)

  480.             f->state_transition[i] = get_symbol(c, state, 1) + c->one_state[i];

  481.     }

  482. 

  483.     f->colorspace                 = get_symbol(c, state, 0); //YUV cs type

  484.     f->avctx->bits_per_raw_sample = get_symbol(c, state, 0);

  485.     f->chroma_planes              = get_rac(c, state);

  486.     f->chroma_h_shift             = get_symbol(c, state, 0);

  487.     f->chroma_v_shift             = get_symbol(c, state, 0);

  488.     f->transparency               = get_rac(c, state);

  489.     f->plane_count                = 2 + f->transparency;

  490.     f->num_h_slices               = 1 + get_symbol(c, state, 0);

  491.     f->num_v_slices               = 1 + get_symbol(c, state, 0);

  492. 

  493.     if (f->num_h_slices > (unsigned)f->width ||

  494.         f->num_v_slices > (unsigned)f->height) {

  495.         av_log(f->avctx, AV_LOG_ERROR, "too many slices\n");

  496.         return AVERROR_INVALIDDATA;

  497.     }

  498. 

  499.     f->quant_table_count = get_symbol(c, state, 0);

  500.     if (f->quant_table_count > (unsigned)MAX_QUANT_TABLES)

  501.         return AVERROR_INVALIDDATA;

  502.     for (i = 0; i < f->quant_table_count; i++) {

  503.         f->context_count[i] = read_quant_tables(c, f->quant_tables[i]);

  504.         if (f->context_count[i] < 0) {

  505.             av_log(f->avctx, AV_LOG_ERROR, "read_quant_table error\n");

  506.             return AVERROR_INVALIDDATA;

  507.         }

  508.     }

  509.     if ((ret = ffv1_allocate_initial_states(f)) < 0)

  510.         return ret;

  511. 

  512.     for (i = 0; i < f->quant_table_count; i++)

  513.         if (get_rac(c, state)) {

  514.             for (j = 0; j < f->context_count[i]; j++)

  515.                 for (k = 0; k < CONTEXT_SIZE; k++) {

  516.                     int pred = j ? f->initial_states[i][j - 1][k] : 128;

  517.                     f->initial_states[i][j][k] =

  518.                         (pred + get_symbol(c, state2[k], 1)) & 0xFF;

  519.                 }

  520.         }

  521. 

  522.     if (f->version > 2) {

  523.         f->ec = get_symbol(c, state, 0);

  524.     }

  525. 

  526.     if (f->version > 2) {

  527.         unsigned v;

  528.         v = av_crc(av_crc_get_table(AV_CRC_32_IEEE), 0,

  529.                    f->avctx->extradata, f->avctx->extradata_size);

  530.         if (v) {

  531.             av_log(f->avctx, AV_LOG_ERROR, "CRC mismatch %X!\n", v);

  532.             return AVERROR_INVALIDDATA;

  533.         }

  534.     }

  535. 

  536.     av_log(f->avctx, AV_LOG_VERBOSE,

  537.            "FFV1 version %d.%d colorspace %d - %d bits - %d/%d planes, %s transparent - tile geometry %dx%d - %s\n",

  538.            f->version, f->minor_version, f->colorspace, f->avctx->bits_per_raw_sample,

  539.            f->plane_count, f->chroma_planes, f->transparency ? "" : "not",

  540.            f->num_h_slices, f->num_v_slices,

  541.            f->ec ? "per-slice crc" : "no crc");

  542. 

  543.     return 0;

  544. }

  545. 

  546. 

  547. static int read_header(FFV1Context *f)

  548. {

  549.     uint8_t state[CONTEXT_SIZE];

  550.     int i, j, context_count = -1;

  551.     RangeCoder *const c = &f->slice_context[0]->c;

  552. 

  553.     memset(state, 128, sizeof(state));

  554. 

  555.     if (f->version < 2) {

  556.         int chroma_planes, chroma_h_shift, chroma_v_shift, transparency, colorspace, bits_per_raw_sample;

  557.         unsigned v = get_symbol(c, state, 0);

  558.         if (v > 1) {

  559.             av_log(f->avctx, AV_LOG_ERROR,

  560.                    "invalid version %d in version 1 header\n", v);

  561.             return AVERROR_INVALIDDATA;

  562.         }

  563.         f->version = v;

  564. 

  565.         f->ac = get_symbol(c, state, 0);

  566. 

  567.         if (f->ac == AC_RANGE_CUSTOM_TAB) {

  568.             for (i = 1; i < 256; i++)

  569.                 f->state_transition[i] =

  570.                     get_symbol(c, state, 1) + c->one_state[i];

  571.         }

  572. 

  573.         colorspace          = get_symbol(c, state, 0); //YUV cs type

  574.         bits_per_raw_sample = f->version > 0 ? get_symbol(c, state, 0) : f->avctx->bits_per_raw_sample;

  575.         chroma_planes       = get_rac(c, state);

  576.         chroma_h_shift      = get_symbol(c, state, 0);

  577.         chroma_v_shift      = get_symbol(c, state, 0);

  578.         transparency        = get_rac(c, state);

  579. 

  580.         if (f->plane_count) {

  581.             if (colorspace          != f->colorspace                 ||

  582.                 bits_per_raw_sample != f->avctx->bits_per_raw_sample ||

  583.                 chroma_planes       != f->chroma_planes              ||

  584.                 chroma_h_shift      != f->chroma_h_shift             ||

  585.                 chroma_v_shift      != f->chroma_v_shift             ||

  586.                 transparency        != f->transparency) {

  587.                 av_log(f->avctx, AV_LOG_ERROR, "Invalid change of global parameters\n");

  588.                 return AVERROR_INVALIDDATA;

  589.             }

  590.         }

  591. 

  592.         f->colorspace                 = colorspace;

  593.         f->avctx->bits_per_raw_sample = bits_per_raw_sample;

  594.         f->chroma_planes              = chroma_planes;

  595.         f->chroma_h_shift             = chroma_h_shift;

  596.         f->chroma_v_shift             = chroma_v_shift;

  597.         f->transparency               = transparency;

  598. 

  599.         f->plane_count    = 2 + f->transparency;

  600.     }

  601. 

  602.     if (f->colorspace == 0) {

  603.         if (f->transparency && f->avctx->bits_per_raw_sample > 8) {

  604.             av_log(f->avctx, AV_LOG_ERROR,

  605.                    "Transparency not supported for bit depth %d\n",

  606.                    f->avctx->bits_per_raw_sample);

  607.             return AVERROR(ENOSYS);

  608.         }

  609.         if (!f->transparency && !f->chroma_planes) {

  610.             if (f->avctx->bits_per_raw_sample <= 8)

  611.                 f->avctx->pix_fmt = AV_PIX_FMT_GRAY8;

  612.             else

  613.                 f->avctx->pix_fmt = AV_PIX_FMT_GRAY16;

  614.         } else if (f->avctx->bits_per_raw_sample <= 8 && !f->transparency) {

  615.             switch (16 * f->chroma_h_shift + f->chroma_v_shift) {

  616.             case 0x00:

  617.                 f->avctx->pix_fmt = AV_PIX_FMT_YUV444P;

  618.                 break;

  619.             case 0x01:

  620.                 f->avctx->pix_fmt = AV_PIX_FMT_YUV440P;

  621.                 break;

  622.             case 0x10:

  623.                 f->avctx->pix_fmt = AV_PIX_FMT_YUV422P;

  624.                 break;

  625.             case 0x11:

  626.                 f->avctx->pix_fmt = AV_PIX_FMT_YUV420P;

  627.                 break;

  628.             case 0x20:

  629.                 f->avctx->pix_fmt = AV_PIX_FMT_YUV411P;

  630.                 break;

  631.             case 0x22:

  632.                 f->avctx->pix_fmt = AV_PIX_FMT_YUV410P;

  633.                 break;

  634.             default:

  635.                 av_log(f->avctx, AV_LOG_ERROR, "format not supported\n");

  636.                 return AVERROR(ENOSYS);

  637.             }

  638.         } else if (f->avctx->bits_per_raw_sample <= 8 && f->transparency) {

  639.             switch (16 * f->chroma_h_shift + f->chroma_v_shift) {

  640.             case 0x00:

  641.                 f->avctx->pix_fmt = AV_PIX_FMT_YUVA444P;

  642.                 break;

  643.             case 0x10:

  644.                 f->avctx->pix_fmt = AV_PIX_FMT_YUVA422P;

  645.                 break;

  646.             case 0x11:

  647.                 f->avctx->pix_fmt = AV_PIX_FMT_YUVA420P;

  648.                 break;

  649.             default:

  650.                 av_log(f->avctx, AV_LOG_ERROR, "format not supported\n");

  651.                 return AVERROR(ENOSYS);

  652.             }

  653.         } else if (f->avctx->bits_per_raw_sample == 9) {

  654.             f->packed_at_lsb = 1;

  655.             switch (16 * f->chroma_h_shift + f->chroma_v_shift) {

  656.             case 0x00:

  657.                 f->avctx->pix_fmt = AV_PIX_FMT_YUV444P9;

  658.                 break;

  659.             case 0x10:

  660.                 f->avctx->pix_fmt = AV_PIX_FMT_YUV422P9;

  661.                 break;

  662.             case 0x11:

  663.                 f->avctx->pix_fmt = AV_PIX_FMT_YUV420P9;

  664.                 break;

  665.             default:

  666.                 av_log(f->avctx, AV_LOG_ERROR, "format not supported\n");

  667.                 return AVERROR(ENOSYS);

  668.             }

  669.         } else if (f->avctx->bits_per_raw_sample == 10) {

  670.             f->packed_at_lsb = 1;

  671.             switch (16 * f->chroma_h_shift + f->chroma_v_shift) {

  672.             case 0x00:

  673.                 f->avctx->pix_fmt = AV_PIX_FMT_YUV444P10;

  674.                 break;

  675.             case 0x10:

  676.                 f->avctx->pix_fmt = AV_PIX_FMT_YUV422P10;

  677.                 break;

  678.             case 0x11:

  679.                 f->avctx->pix_fmt = AV_PIX_FMT_YUV420P10;

  680.                 break;

  681.             default:

  682.                 av_log(f->avctx, AV_LOG_ERROR, "format not supported\n");

  683.                 return AVERROR(ENOSYS);

  684.             }

  685.         } else {

  686.             switch (16 * f->chroma_h_shift + f->chroma_v_shift) {

  687.             case 0x00:

  688.                 f->avctx->pix_fmt = AV_PIX_FMT_YUV444P16;

  689.                 break;

  690.             case 0x10:

  691.                 f->avctx->pix_fmt = AV_PIX_FMT_YUV422P16;

  692.                 break;

  693.             case 0x11:

  694.                 f->avctx->pix_fmt = AV_PIX_FMT_YUV420P16;

  695.                 break;

  696.             default:

  697.                 av_log(f->avctx, AV_LOG_ERROR, "format not supported\n");

  698.                 return AVERROR(ENOSYS);

  699.             }

  700.         }

  701.     } else if (f->colorspace == 1) {

  702.         if (f->chroma_h_shift || f->chroma_v_shift) {

  703.             av_log(f->avctx, AV_LOG_ERROR,

  704.                    "chroma subsampling not supported in this colorspace\n");

  705.             return AVERROR(ENOSYS);

  706.         }

  707.         if (f->transparency) {

  708.             av_log(f->avctx, AV_LOG_ERROR,

  709.                    "Transparency not supported in this colorspace\n");

  710.                    return AVERROR(ENOSYS);

  711.         }

  712.         switch (f->avctx->bits_per_raw_sample) {

  713.         case 0:

  714.         case 8:

  715.             f->avctx->pix_fmt = AV_PIX_FMT_RGB32;

  716.             break;

  717.         case 9:

  718.             f->avctx->pix_fmt = AV_PIX_FMT_GBRP9;

  719.             break;

  720.         case 10:

  721.             f->avctx->pix_fmt = AV_PIX_FMT_GBRP10;

  722.             break;

  723.         default:

  724.             av_log(f->avctx, AV_LOG_ERROR,

  725.                    "bit depth %d not supported\n",

  726.                    f->avctx->bits_per_raw_sample);

  727.             return AVERROR(ENOSYS);

  728.         }

  729.     } else {

  730.         av_log(f->avctx, AV_LOG_ERROR, "colorspace not supported\n");

  731.         return AVERROR(ENOSYS);

  732.     }

  733. 

  734.     ff_dlog(f->avctx, "%d %d %d\n",

  735.             f->chroma_h_shift, f->chroma_v_shift, f->avctx->pix_fmt);

  736.     if (f->version < 2) {

  737.         context_count = read_quant_tables(c, f->quant_table);

  738.         if (context_count < 0) {

  739.             av_log(f->avctx, AV_LOG_ERROR, "read_quant_table error\n");

  740.             return AVERROR_INVALIDDATA;

  741.         }

  742.     } else if (f->version < 3) {

  743.         f->slice_count = get_symbol(c, state, 0);

  744.     } else {

  745.         const uint8_t *p = c->bytestream_end;

  746.         for (f->slice_count = 0;

  747.              f->slice_count < MAX_SLICES && 3 < p - c->bytestream_start;

  748.              f->slice_count++) {

  749.             int trailer = 3 + 5 * !!f->ec;

  750.             int size    = AV_RB24(p - trailer);

  751.             if (size + trailer > p - c->bytestream_start)

  752.                 break;

  753.             p -= size + trailer;

  754.         }

  755.     }

  756.     if (f->slice_count > (unsigned)MAX_SLICES || f->slice_count <= 0) {

  757.         av_log(f->avctx, AV_LOG_ERROR, "slice count %d is invalid\n",

  758.                f->slice_count);

  759.         return AVERROR_INVALIDDATA;

  760.     }

  761. 

  762.     for (j = 0; j < f->slice_count; j++) {

  763.         FFV1Context *fs = f->slice_context[j];

  764.         fs->ac            = f->ac;

  765.         fs->packed_at_lsb = f->packed_at_lsb;

  766. 

  767.         fs->slice_damaged = 0;

  768. 

  769.         if (f->version == 2) {

  770.             fs->slice_x     = get_symbol(c, state, 0) * f->width;

  771.             fs->slice_y     = get_symbol(c, state, 0) * f->height;

  772.             fs->slice_width =

  773.                 (get_symbol(c, state, 0) + 1) * f->width + fs->slice_x;

  774.             fs->slice_height =

  775.                 (get_symbol(c, state, 0) + 1) * f->height + fs->slice_y;

  776. 

  777.             fs->slice_x      /= f->num_h_slices;

  778.             fs->slice_y      /= f->num_v_slices;

  779.             fs->slice_width  = fs->slice_width  / f->num_h_slices - fs->slice_x;

  780.             fs->slice_height = fs->slice_height / f->num_v_slices - fs->slice_y;

  781.             if ((unsigned)fs->slice_width > f->width ||

  782.                 (unsigned)fs->slice_height > f->height)

  783.                 return AVERROR_INVALIDDATA;

  784.             if ((unsigned)fs->slice_x + (uint64_t)fs->slice_width > f->width

  785.                 || (unsigned)fs->slice_y + (uint64_t)fs->slice_height >

  786.                 f->height)

  787.                 return AVERROR_INVALIDDATA;

  788.         }

  789. 

  790.         for (i = 0; i < f->plane_count; i++) {

  791.             PlaneContext *const p = &fs->plane[i];

  792. 

  793.             if (f->version == 2) {

  794.                 int idx = get_symbol(c, state, 0);

  795.                 if (idx > (unsigned)f->quant_table_count) {

  796.                     av_log(f->avctx, AV_LOG_ERROR,

  797.                            "quant_table_index out of range\n");

  798.                     return AVERROR_INVALIDDATA;

  799.                 }

  800.                 p->quant_table_index = idx;

  801.                 memcpy(p->quant_table, f->quant_tables[idx],

  802.                        sizeof(p->quant_table));

  803.                 context_count = f->context_count[idx];

  804.             } else {

  805.                 memcpy(p->quant_table, f->quant_table, sizeof(p->quant_table));

  806.             }

  807. 

  808.             if (f->version <= 2) {

  809.                 av_assert0(context_count >= 0);

  810.                 if (p->context_count < context_count) {

  811.                     av_freep(&p->state);

  812.                     av_freep(&p->vlc_state);

  813.                 }

  814.                 p->context_count = context_count;

  815.             }

  816.         }

  817.     }

  818.     return 0;

  819. }

  820. 

  821. static av_cold int ffv1_decode_init(AVCodecContext *avctx)

  822. {

  823.     FFV1Context *f = avctx->priv_data;

  824.     int ret;

  825. 

  826.     ffv1_common_init(avctx);

  827. 

  828.     f->last_picture = av_frame_alloc();

  829.     if (!f->last_picture)

  830.         return AVERROR(ENOMEM);

  831. 

  832.     if (avctx->extradata && (ret = read_extra_header(f)) < 0)

  833.         return ret;

  834. 

  835.     if ((ret = ffv1_init_slice_contexts(f)) < 0)

  836.         return ret;

  837. 

  838.     return 0;

  839. }

  840. 

  841. static int ffv1_decode_frame(AVCodecContext *avctx, void *data,

  842.                              int *got_frame, AVPacket *avpkt)

  843. {

  844.     uint8_t *buf        = avpkt->data;

  845.     int buf_size        = avpkt->size;

  846.     FFV1Context *f      = avctx->priv_data;

  847.     RangeCoder *const c = &f->slice_context[0]->c;

  848.     int i, ret;

  849.     uint8_t keystate = 128;

  850.     uint8_t *buf_p;

  851.     AVFrame *const p    = data;

  852. 

  853.     f->cur = p;

  854. 

  855.     ff_init_range_decoder(c, buf, buf_size);

  856.     ff_build_rac_states(c, 0.05 * (1LL << 32), 256 - 8);

  857. 

  858.     p->pict_type = AV_PICTURE_TYPE_I; //FIXME I vs. P

  859.     if (get_rac(c, &keystate)) {

  860.         p->key_frame    = 1;

  861.         f->key_frame_ok = 0;

  862.         if ((ret = read_header(f)) < 0)

  863.             return ret;

  864.         f->key_frame_ok = 1;

  865.     } else {

  866.         if (!f->key_frame_ok) {

  867.             av_log(avctx, AV_LOG_ERROR,

  868.                    "Cannot decode non-keyframe without valid keyframe\n");

  869.             return AVERROR_INVALIDDATA;

  870.         }

  871.         p->key_frame = 0;

  872.     }

  873. 

  874.     if ((ret = ff_get_buffer(avctx, p, AV_GET_BUFFER_FLAG_REF)) < 0) {

  875.         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");

  876.         return ret;

  877.     }

  878. 

  879.     if (avctx->debug & FF_DEBUG_PICT_INFO)

  880.         av_log(avctx, AV_LOG_DEBUG,

  881.                "ver:%d keyframe:%d coder:%d ec:%d slices:%d bps:%d\n",

  882.                f->version, p->key_frame, f->ac, f->ec, f->slice_count,

  883.                f->avctx->bits_per_raw_sample);

  884. 

  885.     buf_p = buf + buf_size;

  886.     for (i = f->slice_count - 1; i >= 0; i--) {

  887.         FFV1Context *fs = f->slice_context[i];

  888.         int trailer     = 3 + 5 * !!f->ec;

  889.         int v;

  890. 

  891.         if (i || f->version > 2)

  892.             v = AV_RB24(buf_p - trailer) + trailer;

  893.         else

  894.             v = buf_p - c->bytestream_start;

  895.         if (buf_p - c->bytestream_start < v) {

  896.             av_log(avctx, AV_LOG_ERROR, "Slice pointer chain broken\n");

  897.             return AVERROR_INVALIDDATA;

  898.         }

  899.         buf_p -= v;

  900. 

  901.         if (f->ec) {

  902.             unsigned crc = av_crc(av_crc_get_table(AV_CRC_32_IEEE), 0, buf_p, v);

  903.             if (crc) {

  904.                 av_log(f->avctx, AV_LOG_ERROR, "CRC mismatch %X!\n", crc);

  905.                 fs->slice_damaged = 1;

  906.             }

  907.         }

  908. 

  909.         if (i) {

  910.             ff_init_range_decoder(&fs->c, buf_p, v);

  911.         } else

  912.             fs->c.bytestream_end = buf_p + v;

  913. 

  914.         fs->cur = p;

  915.     }

  916. 

  917.     avctx->execute(avctx, decode_slice, &f->slice_context[0], NULL,

  918.                    f->slice_count,

  919.                    sizeof(void *));

  920. 

  921.     for (i = f->slice_count - 1; i >= 0; i--) {

  922.         FFV1Context *fs = f->slice_context[i];

  923.         int j;

  924.         if (fs->slice_damaged && f->last_picture->data[0]) {

  925.             const uint8_t *src[4];

  926.             uint8_t *dst[4];

  927.             for (j = 0; j < 4; j++) {

  928.                 int sh = (j == 1 || j == 2) ? f->chroma_h_shift : 0;

  929.                 int sv = (j == 1 || j == 2) ? f->chroma_v_shift : 0;

  930.                 dst[j] = p->data[j] + p->linesize[j] *

  931.                          (fs->slice_y >> sv) + (fs->slice_x >> sh);

  932.                 src[j] = f->last_picture->data[j] +

  933.                          f->last_picture->linesize[j] *

  934.                          (fs->slice_y >> sv) + (fs->slice_x >> sh);

  935.             }

  936.             av_image_copy(dst, p->linesize, src,

  937.                           f->last_picture->linesize,

  938.                           avctx->pix_fmt, fs->slice_width,

  939.                           fs->slice_height);

  940.         }

  941.     }

  942. 

  943.     f->picture_number++;

  944. 

  945.     av_frame_unref(f->last_picture);

  946.     if ((ret = av_frame_ref(f->last_picture, p)) < 0)

  947.         return ret;

  948.     f->cur = NULL;

  949. 

  950.     *got_frame = 1;

  951. 

  952.     return buf_size;

  953. }

  954. 

  955. static av_cold int ffv1_decode_close(AVCodecContext *avctx)

  956. {

  957.     FFV1Context *s = avctx->priv_data;;

  958. 

  959.     av_frame_free(&s->last_picture);

  960. 

  961.     ffv1_close(avctx);

  962. 

  963.     return 0;

  964. }

  965. 

  966. AVCodec ff_ffv1_decoder = {

  967.     .name           = "ffv1",

  968.     .long_name      = NULL_IF_CONFIG_SMALL("FFmpeg video codec #1"),

  969.     .type           = AVMEDIA_TYPE_VIDEO,

  970.     .id             = AV_CODEC_ID_FFV1,

  971.     .priv_data_size = sizeof(FFV1Context),

  972.     .init           = ffv1_decode_init,

  973.     .close          = ffv1_decode_close,

  974.     .decode         = ffv1_decode_frame,

  975.     .capabilities   = AV_CODEC_CAP_DR1 /*| AV_CODEC_CAP_DRAW_HORIZ_BAND*/ |

  976.                       AV_CODEC_CAP_SLICE_THREADS,

  977. };